Adjustable bladed impeller



June l0, 1952 A. coRNlLLoN ADJUSTABLE BLADED IMPELLER 5 Sheets-Sheet 2Filed Aug. l5, 1948 June l0, 1952 A. coRNlLLoN ADJUSTABLE BLADEDIMPELLER Filed Aug. 13, 1948 5 Sheets-Sheet 3 v @5 om M w h E A nw June10, 1952 A. coRNlLLoN 2,600,097

ADJUSTABLE BLADED` IMPELLER Filed Aug. 13, 1948 5 Sheets-Sheet 4INVENToR.

B Qu

ATT s June 10, 1952 A CORNILLON 2,600,097

ADJUSTABLE BLADED IMPELLER Filed Aug. 13, 1948 5 Sheets-Sheet 5 Qu A/ZVENTOR Patented June 10, 1952 OFFICE ADJUSTABLE BLADED IMPELLER AndrCornillon, Lyon, France Application August 13, 1948, Serial No. 44,030In France September 13, 1947 My invention relates to multi-bladed rotorsfor the propulsion of craft and more particularly of aircraft.

One object of my invention is to provide a multi-bladed rotor ofimproved construction which will be more convenient in use than theknown arrangements.

Another object of my invention is a rotor wherein full engine power willbe used with high eiciency.

Still a further object of my invention isto provide a multi-bladed rotorwhich may give rise to such a lifting action that the aircraft equippedtherewith will be transformed into a helicopter.

With these and other objects in view my improved multi-bladed rotor ispreferably construc-A ted as illustrated in the accompanying drawings inwhich:

Fig. 1 is a rear view of my improved rotor with parts in section, takenalong line I-I of Fig. 3.

Fig. 2 is a fragmental plan view with section taken along line II-II ofFig. l.

Fig. 3 is a plan view taken along line III-III of Fig. 1, the tiltableplate being supposedly removed.

Fig. 4 is an enlarged partial vertical section of the casing taken alongthe axis of a blade to show the mounting of the inner end of a rotorFig. is a perspective View of the rotor supporting member.

Fig. 11 is an enlarged section showing a blade controlling roller in itsguide.

Fig. 12 is a fragmental side view corresponding to Fig. 2 to show thepivotal attachment of the oscillatable plate to the supporting sleeve.

Fig. 13 illustrates the vupper end of the rotor shaft, the drivingpinion supposedly removed.

Figs. 14 and l5 are perspective views illustrating securing members forthe circular rolle guide.

Fig. 16 is a perspective sketch illustrating the operation of thegearing adapted to transform the relatively small angular oscillation ofthe controlling rollers into a large oscillation of the blades, thevarious members being supposedly spaced apart from each other for abetter understanding of the drawing. Y

4 Claims. (Cl. 170-154) Fig. 17 is a side View of the guide-way for thecontrolling rollers, the position in full lines cor'- responding to thenormal forward flight, the position in dash lines corresponding tohovering and the position in dotted linesconcerning backward night.

Figs. 18 to 20 are diagrams showing in full lines the slopes of theguide way and in dash lines the resulting variation of the bladepitch atthe three positions above-mentioned, it being understood that the slopesof they guide-way have been greatly exaggerated forl the sake ofclearness. I

Fig. 21 is a perspective view of an aircraft provided with three rotorsaccording to my invention.

' My improved rotor comprises a four-armed casing formed of upper andlower parts 1, 2 (see Figs. 1, 4 and 5) enclosing Vfour radiallydisposed shafts 3. e 4 f f Each shaft -3 has an enlarged portion and iscarried by two ball bearings, as indicated-at 4 and 5, while two otherball bearings 6 and 'I are provided to prevent axial displacements andto afford smooth rotation. Oiling is ensuredby an axial canal 8 withbranch passages 9, a free space being left between shafts 3 and theinner'faces of the casing. o l

Shafts 3 form the tail'portions of the blades I0 (Fig. 1). The latterarespoon-shaped members made of forged and stamped aluminum alloy. Theyrotate together with casing I, 2 about the vertical axis thereof, asexplained below, and they are at the same time rotatable about their ownaxis.

Casing I, 2 is also -made of light alloy.A Its vertical end faces areprovided with steel sheets II (Fig. 4) fixed by screws I2 (Fig. 6) andunited with each other by screwed steel tongues I3, I4. One of thelatter has a raised end carrying a coil spring I5 and at 90 thereofthere is also provided another angle member I6 carryinganother coilspring I I turned towards spring I5. -Between springs I5 and I'I thereis arranged a flat radial member I8 formed of the ends of a steel bandWholly or partly surrounding the corresponding shaft or tail portion 3and secured thereto by screws. In this manner when the blades oscillatethrough as hereinafter explained, member I8 alternately depressessprings crossing each other, one cf the latter being formed integral bystamping with an axial shaft 2| (Fig. 10). A steel plate is insertedbetween the ends of collar |9 and the bolt heads or nuts to ensurebetter repartition of the wrenching force. Bars 20 may be assembled byany means, for instance by one of them being forced through a transversenotch of the other one. The lower end of shaft-2;|l 'is-provided with astrainer 21a (Fig. 3)"5- Bars 2li.4 and-shaft 2 l' are-boredv axially insuch a manner that oil introduced into shaft 2| may flow into the casingvia strainer 2id, canal 8 and passages 9. x

Shaft 2| is rotatable within a vertical st'el column 22 (Fig. 1) whichis bolted toaninternal.

the said block, the said rods forming shafts for elongated rollers 46rotatably carrying a sleeve 41 (Figs. 7, 8, 9 and 16) having opposedprotruding lugs 48 connected through parallel connecting rods 43 withthe aforesaid lugs 38, 39 Corresponding to the next arm of casing l, 2,as clearly shown in Figs. V3, 8 and 16. On the free end of rods 45 (Fig.9) there is xed a washer 582300' retain oiL 'or' greas' and 'to'-prevent rollers-"46-'fiorn moving-*longitudinally under the action ofcentrifugal force. Sleeve 41 is moreover internally lined with thinsteel sheets to upper and lower parts in section. l`Rollers areinterposed between shaft 2| and columnAZZ-l The upper end of shaft 2|isI provided with a bevel gea-ri which isf keyedfrthereon by."`means-eti a ventical-keyway4a.(Fig;18 thefsaidgearresting on-afrollerbearing# f itself? supported::byl a plate-26e? Andfabovegean24..-shaftf2-l has-,acircularf recess engaged? by;` ring; 2.1.:- .(Eis.:i391 formed of two halves screwed with eachifother: Shaft, 2k-is-.thusprevented fromslidinggdown ej- Gear.; 24meshes-withfa pinion(ZBqcarriedat. the end; of ai. horizontal shaft: 29,- drivon' bythefengine through anappropriate; speed; reducing; ser; It is; of.advantage 'to dispose-for shaft 29, fof-51 twospeeds)correspondingtosubstantially:60,0and2 '15G R. P. M. for shaft 2|.A cross membenidis disposed-betweentheend: bearing of shaftZgjandthefupperfpart l ofspar v 23 to distribute evenlyfthelifting forces. A0nf each; shaft orftail; 3,externallyfofl casing 2`| there issecured alayerf30 v(Iiigg)roflantirfiiction alloy formed--A of ftwo.vsemi-cylindrical sheets xed by means of appropriate.fscrews-.1j` Asleevm is lo,o,se :ly. mounted; onV this layer; suchsleevebi-z-ing,madei in-twofpartsof lightalloyfwithaniuner:steelfsheetfwhchfmay bein .two partsl woundA aroundflayeryw to;-fomr africtional lining imk contact ftherewithjand with-:.twor lateralrpairs oi 'pmtectivegsteelsheetsf31|qandf32 (Fig-.var ex;- tendi-ng;.close to shaft. 3;; On this sleeve-1 ther-exis secured an arcuate base33 integral withfa rod; 34. (Figr'l Scand 16): extending.radially` o fshaf-t 3, butgfhaving its fend;A bentV Alongitudinally o fffsaid shaft.tcbcarry.y a. roller: 35.-; Base 33v is,YiixedngbyA means of; screws,-3asshown rgud; moreoger-two steel ,collars 138-embrace-ithezsaidbasetogether withrits-.supportingsleevei thefendsofasuch collars 36 beingbolted together with theg ends.:of. the inneiysteel sheet.;v Thelateralsheets .3| .and 32r-are falso assembledbg screwsandby;- .smallsteelvtongues'f 31,.' `rIfhertwo-` halves-ofv theg-sleeve are formedwith;V opposed.l protruding: lugs-3,8,j 39; It'willfbefunderstood thatthe unit thusxformed may-, oscillate `-sn'ioot-hly;onu shaft [33undervthe action.- rof rollen '35;.Hasf hereinafterfexplained.' Axialdisplacement on: shaft. 3;::is ,prevented j by. means fory vtwo f; endrings 40e (Fig.l 3); f lxedf.. on Shafts .1 f Gnstheouteri endl-ofleach. arm .of casing' l. 2: theregfis laterallyfxedga block 4 I.-hayingg Aa pro-1 jecting.; .cog 4| agengaging a-groove formed. inthecasing.;arm^-(Fig; 9),: i Blockgf4| g isg-'securedby meansf of. a.steelV collare-2.:- whioh ;is. moreover itL carries; two; horizontal;steel rodsgjll' extending; one; abovesthe: otherfon QlllirsileE ot.

preventwean since the said sleeve and rollers 46'are iiiade of lightalloy.

:.r'. ReferringY to Fig. 8 it will be understood that when theunit 3|32, 33, 34, 35 oscillates, sleeve ,l oscillated ini unison therewith.zSleeve Y4Thas an anti-friction lining 5| (Fig. 6) which'isvxed theretoby any appropriate means, for instance by means `of screws, and itrotates Within asteelacolar 52,(Whichlis.- b1ted=teamther steeltcojllar.53 ls crewecgl .upon icasingfl.- 2. Eigg 6);. This connection isre-inforced by rigid'steel-.memrbers Ssifwhich aregalsoglamped withtheel-.bolts 5.5.4. Andfslsevevlflisprovided Withrinssz-:iilsg 3) eachsideoff col1a-r.v 52;- to prevent. lateralsliding. Sleeve 41 carries acogged steell sector 56a (Figs. 'l and- 16), screwed ,thereonA which.meshes with another steel sector El'clamped on.sl ua.ft il\Q Sector5 1. being smaller infradiusthan sctorfgi, twvill. befunderstoodthatfarsa limited @palesi @dilation-:ivf :1011er .35@ .about `.Shaft .13sthe;r said shaft@ itself isoscillated through.Y a.-rn. uch.,flaijgerlangle. In the embodiment illustratedzvtheangle ofoscillationproyidedifonfroller 3 5. is .of 24 49' and .iti .@.Qfrpoldsli alrangrle0 1 OSGH @Qn-20,5' ?v Afor shaft. 3.and, consequently for..blade lp,-The radial portion of rod 34 is 101.5 millimeters long andattheuppermosihposition. of rollerq35 the l axis ofthelatter is 98millimeters abovethe axis of tail 3, this distance being 78 millimeters*whenroller 35-isvat-the lowe-rn'iost position.. Sector 56a.screwetlfjto:` sleeye 4' |1jis.morover Securedthrcushanf-.intsrmediate1member iof lig-ht alloyA provided with.n ribs-58a which` tinto. notches provided in sleeve 4l, the said'rnemben being.`in turn f fastened "to, sector 56a bygmeansof Smell. Steelwnguesgf.Slesre f4.1. is.: @humos tatablyi retained by rollers-y 46i connecting vrods 49. collar 52 and the reaction of the intermesh, ing cogsof.sectors..afand 51M- At thelower'endfofcolurnn--22 (Figs;1,l 21a-nd 12)there isaj pair-of opposedfpins 63 forming pivots .for apairv of -lugs 6secured; to.=a plate .52, made of pressed aluminum alloy..Plate-lii-.is' alsoprovidedfwith-an angle-.member 6 3 `carrying a pivot64 for a vertical oontrollingro-.IiSJFigs.j 1A and 2). attachedy toa-.bell-cranklever:I B'Glpiv-J otally mounted within vthawing spar 23,-the-.said. lever. 66 being in-turnactuatedby,-means .of: a horizontal tube6'! adapted to-be controlledsfrom. the cockpit of the-.craft throughanyappropriate. ge a .ring .n It will,Y bey understoodV that plater may.thus be tilted aboutpivot pins. Bil.. A'siinf-4v dcated: in-Fig. 2,plate 62 has a `centralholefof` appropriate diameter to'. accommodate.the lower; end of shaft 2|, and it is to be understood that. the=tiltingmotion4 which may be imparted to the saidplateislimited; Y

Blate B Zcarriedralong its-periphery*aufshaped, channelmern-ber |53(Figs. 1, 3vand`11)v adaptedto.

form a; guide-for rollersduring the rctatirin ."o'i

shaft 2| together. withgtheassociatedparts form; ing the rotorproper...d Asdndicated .1nFig-1;.1.

Aindicated at the left part of Fig. 1.

5 rollers 35 have a slightly rounded periphery due to which they fitwithin member 68 with limited play infspite of the inclination of theguide 68. The latter'is secured to the rim of plate 62 by means ofsquare members such as illustrated at 69 in Fig. 14 and 10 in Fig. 15.-Member 69 has two pairs of horizontal lugs, the upper Vone being adaptedto t on the rim of plate 62 while the lower one `embraces the channelmember 68, as Since, as described below, the height of member 68 withrespect to the blades varies along the periphery of plate 62, the lowerpair of lugs (FigL`14) yare of course oblique along the slopes-ofymember '68, and at the uppermost position of member v68 they are shownin Fig. 1 (right) and inFig. 15. Considering now Fig. 2 wherein arrow Tlin- -dicates the direction of rotation of the rotor and arrow 12 thenormal direction of flight vof the aircraft (which is at about 8 vwith-respect to the axisv of pins 60), the channel or guide member 68rises'from vA to B, then sinks from B to C and remains low andhorizontal from C to A, the angle of slopev being very small, say of 130' owing to the suggested diameter of plate 62 (960 millimetersexternally).

'It will easily be grasped that when plate 62 is somewhat tilted fromits horizontal position the angle of oscillation of the blades fromtheir horizontal position may be varied at will.

The operation of my improved device is as follows:

It will be supposed that the aircraft is provided with a rotor undereach wing as clearly shown in Fig. 21.

position shown in full lines in Figs. 1 and 17, that is the 180horizontal portion of the said guideway is on one side of the line AC ofFig. 2 and the 180 slant portion thereof is on the other side. Thedevice illustrated has the horizontal portion of the guide-way on theleft side and thesymmetrical device under the other wing of the craftmust have this same portion on the right side.

When shaft 29 inside the wing is clutched with the engine, the rotor iscaused to rotate and rollers 35v follow the U-shaped guide-way 68. Whenthey are running on' the horizontal portion thereof, the blade pitch isset at When a roller reaches point A (Figs. 2, 17 and :18) it beginsclimbing up and in acting so it rotates about the corresponding bladeaxis. rWhen a roller has reached point B, the angle of its supportingrod 34 (Fig. 8') with a horizontal planefastened to lugs 38, 39 a to andfro movement.v

Since these connecting rods'are connected with lugs 48 of sleeves 41(Figs. 3, 8 and 16) thelatter will be oscillated in unison with sleeves31,32 and through the same angle (24 49' in the constructionillustrated). Tlie cogged sectors 56a (Figs. 7 and 16) secured tosleeves 41 will transmit thisoscillating movement to the small sectors51 with which they are in mesh. The ratio between the radii of sectors56a and 51 being .3.626to Yl, the latter will oscillate through an Plate62 being horizontal, the v'U-shaped guide-way 68 is secured under it atthe cidence -for the slopes of the yangle of 90 (24 49' multiplied by3.626). And sincesectors 51 are secured to the blade tails, Athe bladeswill also oscillate through 90 about their own axes. The inertia torquesor forces This: explains the necessity of small angles of inguide-Way(in the present case 1 30').

When rollers 35 run upwardly from A to B .(Figs. 2, 17 and 18) the bladepitch increases from 0 at A to 90 at B', and when they run i creasesfrom 90 at B to 0 at C.

and the variations of the blade downwardly from B to C, the blade pitchde- The line AC (Fig. 2) which joins the ends of the horizontal vportionof guide-way 68 is at the same time the projection on a horizontal planeof the oscillation axis of plate 62 (line joining the pivoting pins 60);the-line AC' is the line of flight. Figs. 17 and 18 clearly show theslopes of the guide-way pitch resulting therefrom.

It will be understood that such an operation results in apropelling'force imparted to the craft, the steering of which is ensuredas usual through fins and tail rudder.

When hovering is wanted, the pilot pulls tube 61 (Fig. 1)v whereby bar65 is raised by the'crankbell lever 66. Plate 62 is thus caused tooscillate 'about pins 60 (axis AC of Fig. 2) through Vsuch an angle thatpoint D is raised through 10 millimeters and point B 'lowered throughalso 10 millimeters. The guide-way 68 then assumes the position shown indash lines in Fig. 1'7 andthe curves representating the inclinations ofthe various parts thereof and the variations of the blade pitch arethose indicated in Fig. 19. It will be seen that thevblade pitchincreases from 0 to 36 along arc A'B', then decreases from 36 tof0 alongarc B'C'jincreases again from 0 to 36 along CD' and again decreases from36 to 0 along DA. There is no more horizontal' resulting force appliedto the craft but only a vertical lifting component, as in a helicopter.In the construction illustrated the slope of the two `portions ofguide-way 68 is then 1 7 Owing to the vertical radius between pins 60and the diierent parts of guide-.way 68, the oscillation of plate 62causes a slight vertical displacement of points A and C. But thisdisplacement is negligible; in the construction illustrated, supposingthat the distance above-mentioned is llrmillimeters` the verticaldisplacement of points A and C is .038 millimeter and the 'residualblade pitch resulting therefromwould be less than 0 7. f f

Lateral stability of the craft could be ensured by declutching a rotorduring a short instant, or in the case ofseveral engines by adjustingthe throttle valves thereof. Longitudinal stability may be ensured bymeans of an additional variable pitch two-bladed air-screw with fvertical axis disposed above or beneath the aircraft tail; thisadditional airscrew would be stopped with blades disposed along thefuselage during'forv JWard flight.

For flying backwards plate 62 is tilted a little `more'than forhovering, pointl D being raised through about 15 millimeters above theposition of normal flight.' Guide-way 68 then assumes the positionillustrated in dotted lines inrFig. 17 and the curves representing. theslopes thereof andthe variations of the bladepitch` are those einig.:2o. it. win beseen .marine-blasonati varies-from il" to 16 along-ABZ.from .12W-tol? along zB'C", :from 0 to 58 along' CDf and from saD `to 0along .D'A Owing to: the. diierence Vbetween the incidences; atD and B.the Shorizontal reactions. are no more, balanced .and :there `isafpropelling component; `which.:terms -to. move the eraf-t backwards. Theutmost slope of -gui'de-way-is then 1 50"; thevaria-tionLfngheight of.points A Ya-nd C is about...f1: millimeter and the residual blade pitchresulting. therefrom-.gioioso than 0 I19', which is quite negligible..

:order to turn.. the craft. when hovering, whatever may be thenumber ofrotors, it would .be suiicientto set one of. them under Ia: wing: for,forward-flight and another one under pthoother wing -forfbackward..ightwith the same pitch on both sides the aircraft would turn withoutbanking. For instance under one wing. ,a plate 6 2 could -be 'set withits point D raised throughl l5 Ymillimeters while under the other wingfa plate e2- `would y be :set `with its point D raised :through :.5

vmillimeters. l l

With a 160 H. P. engine a pair of fourrbladed .rotors of the :kindillustratedrotating at. i750 obtained.

With blades weighing v'32 ibs. 4 oz. hailing' .their center of `gravity-at -60 millimeters from theiblade axis and :rotatingat Z50 R. 'P.M.=.the springs :may vhave 1;5- coils of steel wire of .3.5`mil-linxeters :in diameter to yprovide an external ycoil diameter of.20 millimeters. The inertia -torques are reduced when hovering, sincethe maximum angular stroke ofthe blades is then-:of .36 Vinstead-of 90`Within the same time. VMoreover the springs prevent the vrol-1ers fromgoing sharply :up rand down i-n'theirguiding channel owing Vtothe-:small vert-ical aplay which should vbe provided .togpermit theirfree rotation. i

It .should 'be vpointed out .that landing fandtaking'off may occureither .fas aghelicopter vor asan .airplanegsinoe the Vuse of warpingailerons .and slotted' flaps is not hindered.

For flying over sandy countries `the rotormay Abe protected by anappropriate fcowling as -explained below in the case of marine craft.

While I have described my Vimproved rotor as applied -to an aircraft, itmust Ibe understood that it may also be applied `to ships. 'In suche.case a pair vof rotors would be Jfired each "side of Athe longitudinalaxis of the ship at the .rear thereof. 'The horizontal driving shaftswould be either longitudinal tothe ship vor .oblique according. to theshape of the hull and 4they wouldbe connected with the engine shaft oryshafts through the hull. Each rotor would 1be venclosed within anappropriate protectivecasingjformed of 'two-parts. The upper one wouldlbe formed Vby 'a sheet screwed -upon the .vertical periphery of 'thexed plate 62 .and extending down to the 'blades 'The lower-part'wouldbein the form of la :trough A.scri-:wed :under the rotor casing, :and ro,toting therewith; .it would extendgupJ-tc :the

blades.. .The :space between; these two would be. closedi :by means .ofneri-ble'. Aslips screwed tothe .fixed upperr part'. andraisedzaby the'blades during; their rotation VThe 4slopesfof the gudemember would.extend over 'hal-f. a quadrant in suchamanner that. the blades would.remain vertical during; .a full Quadrant... 'The bevelpgearing driving:the .rotor woulda-be pro- '.teeted'v within` a cowling andthe; plate.carrying theg-llide memberA (plate 62) would be. xedly :secured to; thehull. 0i course all` parts would be made. ogsteel.

lfolainm: l

. L VA Vxnulti-bladed "rotor, .deviceA for y.tl-.1e-'purpose Aset .forthcomprising a casing; adapted 'for ,rotation about a substantiallyvertical-axis.; @blades radially-disposed around, said casing.eachiofasaid blades :being formed' with .a radial ftaiil .oscil-`.latably' supported by said; casing. each'. of said -tails comprisinga. portion exterior tofsaid casing; a. nonhrotatable circular guidemember disposed at :a variable --heiglltl coqaxiall'y Vto fsad1 casing;a plurality of sleeves, each loosely .carried by one o said itaiis onthe portion thereof'. exterior to .said casing; a. plurality of arms,eacliaadialla secured to ,one of vsa-idsleeves; rollers at the ends ofsaid arms, :said .rollers being. guided vertically .by said guide.member to .be vertically `recipro- -zcated Vin ,unison with .rotationof said casing; a pluralityof osoillatable members `carried''by'.saidcasing.. each yat `a distance from one of said sleeves and the axes ofoscillation of saidoscil.- `latable member and of said sleeve :beingparallel; a pai-r of substantiallyr opposed connecting rods to connecteach of said sleeves: with the .correspending oscillatable member; a.cogged sector :seounedto' each of .said members; and another coggedsector secured Ato .each ofsaid .tails Pto :mesh .with saidrst-namedvcogged sector, -said last-named f cogged sector being smaller in radiusthan said rst-.named cogged sector.

.2. in a multi-.bladed rotor device asclaimedin .claim 1, `saidnon-rotatable .guide member being .Ufshaped insectiomwith the LJ openingEtowards the axis of said casing and each of said A'rollers 4having itsaxis .of rotation substantially always parallelfto the axis of thecorresponding blade.

3. In a. mnlti-.bladed Arotor fas vclaimed in .claim l, saidl.non-.rotatable circular guide member Aforming a vrigid unit 'tiltableabout a -transverse axis .substantially intersecting the axis of`rotation of said casing.

:4. A multi-'bladed rotor device Afor craft propulsion comprisingv incombination a hollow substantially` vertical column secured tothe craft;'a vertical shaft rotatably carried by said column; a casing at Kthelower end -of -said'shaft below said column, said casing being :formedwith a plurality lof hollow radial arms; .rotatable radial shafts eachradially supported'by'one of'said arms, each of said shafts extendingoutwardly-of :said casing rst in the form of a cylindrical tail and`thereiaiter in the -form of a blade; a non-rotatable substantiallyvrigid circular plate carried by v'the lower end ofsaid column coaxiallyto the same and above :said casing; a U-shaped circularguide--memberalso co-axial to said column and secured under saidplate with`the U-opening inwardly; 'a -plurality of sleeves each loosely carried:on-the portion of one vof saidl radial shafts .exterior -to saidcasing; a pluralityor arms leach 4radially secured 4to each of saidsleeves; a plurality -of Arollers each -rotatably vsecured at Athe free`end vof each of said last-named radial arms withgtne lolleraxiipelallelto the axis of the correspond` ing radial shaft, saidrollers engaging said U-shaped circular guide-member to be verticallyreciprocated thereby; a plurality of oscillatable members carried bysaid casing each at a distance from one of said sleeves and in parallelrelation thereto; a pair of connecting rods to connect each of saidoscillatable memberswith the corresponding one of said sleeves; aplurality of cogged sectors each secured to one of said radial shafts onthe portion thereof exterior to said casing; and a plurality of coggedsectors each secured to each of said oscillatable members, saidlast-named cogged sectors being larger in radius than said rst-namedcogged sectors and each of said last-named sectors meshing with one ofsaid first-named sectors.

ANDRE CORNILLON.

10 REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS

